Concept stocks of CPO fluctuated down during the trading day, with companies such as Unilumin Group and FiberHome Technologies hitting the daily limit down.

Concept stocks in the CPO market fluctuated and fell during trading hours, with companies such as Sunway Communication and Changfei Optical Fiber hitting the limit down. Redick, Zhishang Technology, and Yuanjie Technology were among the top decliners.